PT-2020-5443 · Dompurify · Dompurify

Published 2020-10-07 · Updated 2022-04-27 · CVE-2020-26870

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions DOMPurify versions prior to 2.0.17

Description The issue is related to the DOMPurify library and its failure to protect the structure of a web page. This can be exploited by a remote attacker to perform a cross-site scripting attack. Specifically, the problem occurs because a serialize-parse roundtrip does not necessarily return the original DOM tree, and a namespace can change from HTML to MathML, as demonstrated by nesting of FORM elements.

Recommendations For DOMPurify versions prior to 2.0.17, update to version 2.0.17 or later to resolve the issue. As a temporary workaround, consider restricting the use of the DOMPurify library until a patch is applied.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BDU:2021-00576

CVE-2020-26870

DLA-2419-1

GHSA-63Q7-H895-M982

Affected Products

Dompurify

References · 22

• 🔥 https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass · Exploit
• https://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17 · Patch
• https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d · Patch
• https://oracle.com//security-alerts/cpujul2021.html · Patch
• https://osv.dev/vulnerability/DLA-2419-1 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-63q7-h895-m982 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-26870 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-26870 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-26870 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-00576 · Security Note
• https://ubuntu.com/security/CVE-2020-26870 · Vendor Advisory
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-26870 · Security Note
• https://cve.org/CVERecord?id=CVE-2020-26870 · Security Note
• https://github.com/cure53/DOMPurify · Note